综合地球物理在内蒙古多伦县核桃坝地区铀矿勘查中的应用

李英宾; 张伟; 邱崇涛

doi:10.19509/j.cnki.dzkq.tb20230281

综合地球物理在内蒙古多伦县核桃坝地区铀矿勘查中的应用

doi: 10.19509/j.cnki.dzkq.tb20230281

李英宾^{1, 2, 3, ,},
张伟^{1, 2, 3},
邱崇涛^{1, 2, 3}

1.
核工业航测遥感中心, 石家庄 050002
2.
中核集团铀资源地球物理勘查技术中心(重点实验室), 石家庄 050002
3.
河北省航空探测与遥感技术重点实验室, 石家庄 050002

基金项目:

中国核工业地质局项目 202104-1

详细信息

通讯作者:
李英宾, E-mail: 799982826@qq.com

中图分类号: P631;P619.14
计量
- 文章访问数: 386
- PDF下载量: 41
- 被引次数: 0
出版历程
- 收稿日期: 2023-05-22
- 录用日期: 2023-09-28
- 修回日期: 2023-09-27

Application of comprehensive geophysics in uranium exploration in the Hetaoba area of Duolun County, Inner Mongolia

LI Yingbin^{1, 2, 3
, ,},
ZHANG Wei^{1, 2, 3},
QIU Chongtao^{1, 2, 3}

1.
Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, China
2.
CNNC Key Laboratory of Uranium Resources Geophysical Exploration Technology, Shijiazhuang 050002, China
3.
Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology, Shijiazhuang 050002, China

More Information

Corresponding author: LI Yingbin, E-mail: 799982826@qq.com

摘要

摘要:
核桃坝地区铀成矿条件优越，在该区东部已取得较好的找矿成果，西部尚未取得找矿突破。研究区铀矿化受断裂构造、破碎带控制明显，查明该区断裂构造格架和构造破碎、蚀变带的分布，推断成矿有利区，为进一步挖掘该地区的铀成矿潜力提供地球物理资料。通过音频大地电磁测量、土壤氡测量和地面高精度磁测3种物探方法的联合应用，圈定了土壤氡异常；查明断裂F₁₃北西部断裂呈现NE向和NW向"田"字格排列，断裂F₁₂南东部断裂呈现NE向。断裂F₁₃、F₁₂夹持部位断裂呈现近SN向和NW向；推断构造蚀变、破碎带6处。结合该区铀矿化特征，构造蚀变、破碎带S1、S2、S3、S4，处于断裂交汇、夹持部位，规模较大，且周围分布多个土壤氡异常，异常幅值可达35 000 Bq/m³，为成矿有利地段。经钻探验证，钻孔ZKH24深部发现了构造蚀变、破碎带和富厚铀矿体，后续在S2构造蚀变带内发现了多个工业铀矿孔，并发现了矿体较好的钻孔ZKH7-1，落实了铀矿产地，说明此3种物探方法联合应用在该地区铀矿找矿工作中具有较好的效果，可在该类型铀矿勘查工作中推广应用。
- 核桃坝地区 /
- 音频大地电磁测量 /
- 土壤氡测量 /
- 地面高精度磁测 /
- 铀矿勘查
Abstract: Objective
The Hetaoba area in Inner Mongolia has superior uranium metallogenic conditions.Grea tore-prospecting results have been achieved in the eastern part of the study area.However, breakthrough has not been made in the western area. Uranium mineralization is significantly controlled by faults and fractured zones. To identify the distributions of fault framework, structural fracture and alteration zones, and further to infer the favorable metallogenesis areas, geophysical data are provided to explore the uranium metallogenic potential.
Methods
Through the comprehensive applications of three geophysical methods, including audiomagnetotelluric surveys, soil radon measurements, and ground high-precision magnetic measurements, soil radon anomalies are delineated in the study area. The northwest fault F₁₃ shows a northeast- and northwest-trending with a Chinese word "Tian" grid shape, while the southeast fault F₁₂ presents a northeast-trending grid shape. The faults of F₁₃ and F₁₂ present nearly north-south and northwest trendings in the pinched zones.There are six structural alterated and fractured zones to be inferred.
Results
Based on the characteristics of uranium mineralization, it is inferred that the structural alteration and fracture zones of S1, S2, S3 and S4 are located at the intersection and pinched zone of faults, with a large scale. Multiple soil radon anomalies are distributed with an anomaly amplitude up to 35 000 Bq/m³, which are the favorable areas for metallogenesis.
Conclusion
After verification of the drilling results, the structural alteration, fracture zones and thick uranium ore bodies are discovered in the deep of borehole ZKH24. Many industrial uranium ore holes are discovered in the S2 structural alteration zone. Borehole ZKH7-1 has good ore findings, confirming the origin place of the uranium ore. The study indicates that the comprehensive application of the three geophysical methods has effective results in uranium ore exploration and can be promoted to uranium ore prospecting.
- Hetaoba area /
- audiomagnetotelluric survey /
- soil radon measurement /
- ground high-precision magnetic measurement /
- uranium exploration
注释:

所有作者声明不存在利益冲突。

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图 1 研究区地质简图

Figure 1. Geological sketch of geology in the study area

下载: 全尺寸图片幻灯片

图 2 核桃坝地区磁法综合图

Figure 2. Comprehensive map of ground magnetic measurement in the Hetaoba area

下载: 全尺寸图片幻灯片

图 3 核桃坝地区磁异常断裂构造解释图

Figure 3. Fault interpretation from magnetic anomaly in the Hetaoba area

下载: 全尺寸图片幻灯片

图 4 核桃坝地区土壤氡异常分布图

Figure 4. Anomaly map of soil radon in the Hetaoba area

下载: 全尺寸图片幻灯片

图 5 Z21Y01线综合物探剖面及地质推断解释图

Figure 5. Comprehensive geophysical section and geological interpretation of the Line Z21Y01

下载: 全尺寸图片幻灯片

图 6 音频大地电磁反演300 m深度电阻率分布图

Figure 6. Resistivity map of audiomagnetotelluric inversion of 300 m depth

下载: 全尺寸图片幻灯片

图 7 综合地质解释与钻孔揭露情况对比图

Figure 7. Comparison of comprehensive geological interpretation and borehole

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表 1 岩石物性参数测量结果

Table 1. The rocks physical properties measurement results

岩性	组数	电阻率/(Ω·m)		组数	磁化率/10^-5SI
岩性	组数	变化范围	几何平均值	组数	变化范围	几何平均值
流纹岩	30	183~3 900	945	31	5~25	12.5
凝灰岩	31	266~3 326	902	30	4~32	13.2
流纹斑岩	31	1 451~5 659	2 544	34	28~1430	316.8
凝灰岩(蚀变、破碎)	30	159~967	380
流纹岩(蚀变)				30	208~1 530	603.2

下载: 导出CSV

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